Created
May 31, 2022 20:34
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List files in each layer of an image tarball created through `docker save`.
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#! /usr/bin/env python3 | |
# -*- coding: utf-8 -*- | |
# vim:fenc=utf-8 | |
# | |
# Copyright © 2022 Pi-Yueh Chuang <pychuang@pm.me> | |
# | |
# Distributed under terms of the BSD 3-Clause license. | |
"""List files in each layer of an image tarball created through `docker save`. | |
""" | |
import argparse | |
import logging | |
import pathlib | |
import tarfile | |
import tempfile | |
def main(image, logger): | |
"""Main function. | |
""" | |
with tarfile.open(image, "r") as fobj: | |
member = fobj.next() | |
while member is not None: | |
if "layer.tar" not in member.name: | |
member = fobj.next() | |
continue | |
logger.info(f"{member.name}") | |
with tempfile.TemporaryDirectory() as tempdir: | |
fobj.extract(member, tempdir) | |
with tarfile.open(f"{tempdir}/{member.name}", "r") as subfobj: | |
submember = subfobj.next() | |
while submember is not None: | |
logger.info(f"\t{submember.name}") | |
submember = subfobj.next() | |
logger.info("") | |
member = fobj.next() | |
if __name__ == "__main__": | |
parser = argparse.ArgumentParser(description="List files in each layer of a Docker image (in *.tar.gz format)") | |
parser.add_argument("image", metavar="IMAGE", action="store", type=pathlib.Path) | |
parser.add_argument("logfile", metavar="LOGFILE", action="store", type=pathlib.Path) | |
args = parser.parse_args() | |
logger = logging.getLogger(__name__) | |
logging.basicConfig(handlers=[logging.NullHandler()], format="%(message)s", level=logging.DEBUG) | |
logger.addHandler(logging.StreamHandler()) | |
logger.addHandler(logging.FileHandler(args.logfile, "w", "utf-8")) | |
main(args.image, logger) |
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